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317 lines
11 KiB
C
317 lines
11 KiB
C
/* Atomic operations. PowerPC Common version.
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Copyright (C) 2003-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/*
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* Never include sysdeps/powerpc/atomic-machine.h directly.
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* Always use include/atomic.h which will include either
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* sysdeps/powerpc/powerpc32/atomic-machine.h
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* or
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* sysdeps/powerpc/powerpc64/atomic-machine.h
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* as appropriate and which in turn include this file.
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*/
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/*
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* Powerpc does not have byte and halfword forms of load and reserve and
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* store conditional. So for powerpc we stub out the 8- and 16-bit forms.
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*/
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#define __arch_compare_and_exchange_bool_8_acq(mem, newval, oldval) \
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(abort (), 0)
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#define __arch_compare_and_exchange_bool_16_acq(mem, newval, oldval) \
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(abort (), 0)
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#define __ARCH_ACQ_INSTR "isync"
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#ifndef __ARCH_REL_INSTR
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# define __ARCH_REL_INSTR "sync"
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#endif
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#ifndef MUTEX_HINT_ACQ
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# define MUTEX_HINT_ACQ
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#endif
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#ifndef MUTEX_HINT_REL
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# define MUTEX_HINT_REL
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#endif
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#define atomic_full_barrier() __asm ("sync" ::: "memory")
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#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
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({ \
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__typeof (*(mem)) __tmp; \
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__typeof (mem) __memp = (mem); \
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__asm __volatile ( \
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"1: lwarx %0,0,%1" MUTEX_HINT_ACQ "\n" \
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" cmpw %0,%2\n" \
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" bne 2f\n" \
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" stwcx. %3,0,%1\n" \
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" bne- 1b\n" \
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"2: " __ARCH_ACQ_INSTR \
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: "=&r" (__tmp) \
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: "b" (__memp), "r" (oldval), "r" (newval) \
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: "cr0", "memory"); \
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__tmp; \
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})
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#define __arch_compare_and_exchange_val_32_rel(mem, newval, oldval) \
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({ \
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__typeof (*(mem)) __tmp; \
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__typeof (mem) __memp = (mem); \
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__asm __volatile (__ARCH_REL_INSTR "\n" \
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"1: lwarx %0,0,%1" MUTEX_HINT_REL "\n" \
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" cmpw %0,%2\n" \
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" bne 2f\n" \
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" stwcx. %3,0,%1\n" \
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" bne- 1b\n" \
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"2: " \
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: "=&r" (__tmp) \
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: "b" (__memp), "r" (oldval), "r" (newval) \
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: "cr0", "memory"); \
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__tmp; \
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})
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#define __arch_atomic_exchange_32_acq(mem, value) \
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({ \
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__typeof (*mem) __val; \
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__asm __volatile ( \
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"1: lwarx %0,0,%2" MUTEX_HINT_ACQ "\n" \
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" stwcx. %3,0,%2\n" \
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" bne- 1b\n" \
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" " __ARCH_ACQ_INSTR \
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: "=&r" (__val), "=m" (*mem) \
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: "b" (mem), "r" (value), "m" (*mem) \
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: "cr0", "memory"); \
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__val; \
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})
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#define __arch_atomic_exchange_32_rel(mem, value) \
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({ \
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__typeof (*mem) __val; \
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__asm __volatile (__ARCH_REL_INSTR "\n" \
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"1: lwarx %0,0,%2" MUTEX_HINT_REL "\n" \
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" stwcx. %3,0,%2\n" \
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" bne- 1b" \
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: "=&r" (__val), "=m" (*mem) \
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: "b" (mem), "r" (value), "m" (*mem) \
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: "cr0", "memory"); \
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__val; \
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})
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#define __arch_atomic_exchange_and_add_32(mem, value) \
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({ \
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__typeof (*mem) __val, __tmp; \
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__asm __volatile ("1: lwarx %0,0,%3\n" \
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" add %1,%0,%4\n" \
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" stwcx. %1,0,%3\n" \
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" bne- 1b" \
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: "=&b" (__val), "=&r" (__tmp), "=m" (*mem) \
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: "b" (mem), "r" (value), "m" (*mem) \
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: "cr0", "memory"); \
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__val; \
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})
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#define __arch_atomic_exchange_and_add_32_acq(mem, value) \
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({ \
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__typeof (*mem) __val, __tmp; \
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__asm __volatile ("1: lwarx %0,0,%3" MUTEX_HINT_ACQ "\n" \
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" add %1,%0,%4\n" \
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" stwcx. %1,0,%3\n" \
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" bne- 1b\n" \
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__ARCH_ACQ_INSTR \
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: "=&b" (__val), "=&r" (__tmp), "=m" (*mem) \
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: "b" (mem), "r" (value), "m" (*mem) \
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: "cr0", "memory"); \
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__val; \
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})
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#define __arch_atomic_exchange_and_add_32_rel(mem, value) \
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({ \
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__typeof (*mem) __val, __tmp; \
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__asm __volatile (__ARCH_REL_INSTR "\n" \
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"1: lwarx %0,0,%3" MUTEX_HINT_REL "\n" \
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" add %1,%0,%4\n" \
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" stwcx. %1,0,%3\n" \
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" bne- 1b" \
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: "=&b" (__val), "=&r" (__tmp), "=m" (*mem) \
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: "b" (mem), "r" (value), "m" (*mem) \
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: "cr0", "memory"); \
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__val; \
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})
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#define __arch_atomic_increment_val_32(mem) \
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({ \
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__typeof (*(mem)) __val; \
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__asm __volatile ("1: lwarx %0,0,%2\n" \
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" addi %0,%0,1\n" \
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" stwcx. %0,0,%2\n" \
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" bne- 1b" \
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: "=&b" (__val), "=m" (*mem) \
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: "b" (mem), "m" (*mem) \
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: "cr0", "memory"); \
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__val; \
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})
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#define __arch_atomic_decrement_val_32(mem) \
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({ \
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__typeof (*(mem)) __val; \
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__asm __volatile ("1: lwarx %0,0,%2\n" \
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" subi %0,%0,1\n" \
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" stwcx. %0,0,%2\n" \
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" bne- 1b" \
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: "=&b" (__val), "=m" (*mem) \
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: "b" (mem), "m" (*mem) \
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: "cr0", "memory"); \
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__val; \
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})
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#define __arch_atomic_decrement_if_positive_32(mem) \
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({ int __val, __tmp; \
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__asm __volatile ("1: lwarx %0,0,%3\n" \
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" cmpwi 0,%0,0\n" \
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" addi %1,%0,-1\n" \
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" ble 2f\n" \
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" stwcx. %1,0,%3\n" \
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" bne- 1b\n" \
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"2: " __ARCH_ACQ_INSTR \
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: "=&b" (__val), "=&r" (__tmp), "=m" (*mem) \
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: "b" (mem), "m" (*mem) \
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: "cr0", "memory"); \
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__val; \
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})
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#define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
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({ \
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__typeof (*(mem)) __result; \
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if (sizeof (*mem) == 4) \
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__result = __arch_compare_and_exchange_val_32_acq(mem, newval, oldval); \
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else if (sizeof (*mem) == 8) \
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__result = __arch_compare_and_exchange_val_64_acq(mem, newval, oldval); \
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else \
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abort (); \
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__result; \
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})
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#define atomic_compare_and_exchange_val_rel(mem, newval, oldval) \
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({ \
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__typeof (*(mem)) __result; \
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if (sizeof (*mem) == 4) \
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__result = __arch_compare_and_exchange_val_32_rel(mem, newval, oldval); \
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else if (sizeof (*mem) == 8) \
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__result = __arch_compare_and_exchange_val_64_rel(mem, newval, oldval); \
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else \
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abort (); \
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__result; \
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})
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#define atomic_exchange_acq(mem, value) \
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({ \
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__typeof (*(mem)) __result; \
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if (sizeof (*mem) == 4) \
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__result = __arch_atomic_exchange_32_acq (mem, value); \
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else if (sizeof (*mem) == 8) \
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__result = __arch_atomic_exchange_64_acq (mem, value); \
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else \
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abort (); \
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__result; \
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})
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#define atomic_exchange_rel(mem, value) \
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({ \
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__typeof (*(mem)) __result; \
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if (sizeof (*mem) == 4) \
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__result = __arch_atomic_exchange_32_rel (mem, value); \
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else if (sizeof (*mem) == 8) \
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__result = __arch_atomic_exchange_64_rel (mem, value); \
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else \
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abort (); \
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__result; \
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})
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#define atomic_exchange_and_add(mem, value) \
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({ \
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__typeof (*(mem)) __result; \
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if (sizeof (*mem) == 4) \
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__result = __arch_atomic_exchange_and_add_32 (mem, value); \
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else if (sizeof (*mem) == 8) \
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__result = __arch_atomic_exchange_and_add_64 (mem, value); \
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else \
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abort (); \
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__result; \
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})
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#define atomic_exchange_and_add_acq(mem, value) \
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({ \
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__typeof (*(mem)) __result; \
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if (sizeof (*mem) == 4) \
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__result = __arch_atomic_exchange_and_add_32_acq (mem, value); \
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else if (sizeof (*mem) == 8) \
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__result = __arch_atomic_exchange_and_add_64_acq (mem, value); \
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else \
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abort (); \
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__result; \
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})
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#define atomic_exchange_and_add_rel(mem, value) \
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({ \
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__typeof (*(mem)) __result; \
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if (sizeof (*mem) == 4) \
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__result = __arch_atomic_exchange_and_add_32_rel (mem, value); \
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else if (sizeof (*mem) == 8) \
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__result = __arch_atomic_exchange_and_add_64_rel (mem, value); \
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else \
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abort (); \
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__result; \
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})
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#define atomic_increment_val(mem) \
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({ \
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__typeof (*(mem)) __result; \
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if (sizeof (*(mem)) == 4) \
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__result = __arch_atomic_increment_val_32 (mem); \
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else if (sizeof (*(mem)) == 8) \
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__result = __arch_atomic_increment_val_64 (mem); \
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else \
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abort (); \
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__result; \
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})
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#define atomic_increment(mem) ({ atomic_increment_val (mem); (void) 0; })
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#define atomic_decrement_val(mem) \
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({ \
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__typeof (*(mem)) __result; \
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if (sizeof (*(mem)) == 4) \
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__result = __arch_atomic_decrement_val_32 (mem); \
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else if (sizeof (*(mem)) == 8) \
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__result = __arch_atomic_decrement_val_64 (mem); \
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else \
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abort (); \
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__result; \
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})
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#define atomic_decrement(mem) ({ atomic_decrement_val (mem); (void) 0; })
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/* Decrement *MEM if it is > 0, and return the old value. */
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#define atomic_decrement_if_positive(mem) \
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({ __typeof (*(mem)) __result; \
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if (sizeof (*mem) == 4) \
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__result = __arch_atomic_decrement_if_positive_32 (mem); \
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else if (sizeof (*mem) == 8) \
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__result = __arch_atomic_decrement_if_positive_64 (mem); \
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else \
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abort (); \
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__result; \
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})
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